On Tue, 2003-10-07 at 13:31, Perry E. Metzger wrote:
> Stephen Reed <reed@cyc.com> writes:
> > Or if that is not the case
> > then I say that one of Cyc's RGB color representations is unambiguous
> > given its vocabulary for stating the intensity of the red, green, and
> > blue light that make up the perceived color.
>
> But of course, it is not obvious that the RGB representation is
> sufficiently accurate to unambiguously describe all colors.

Fluorescent colors are an example of human perceivable colors that
cannot be represented in RGB. RGB is a good approximation of human
color perception, but not exhaustive.